I have spoken with a number of electricians but none of whom have any real audio-specific experience.You really don't need an electrician that is audio savvy.
Tmmvinyl
You just need to do your homework and write up a set of specs you want him to follow. The electrician will look at the specs then he will tell you what he can do and cannot do to meet code in the state and city you live in.
The electricians in your area will know the local codes for your area.
Example, he may not be able to use/install NM-B sheathed cable, (Romex is a trade name for NM-B), by code in your area for branch circuit wiring. The wiring may have to be installed in metallic conduit. If that is the case ask him if aluminum armor MC cable meets code. If so have him use AL armor MC cable with solid core conductors. Three wire, hot, neutral, and green insulated equipment ground. One MC cable for each dedicated branch circuit you want.
Avoid pulling branch circuit wiring in an empty installed conduit. Avoid installing a dedicated branch in a conduit with other branch circuits.
Pay close attention to pages 31 through 36
An Overview of Audio System
Grounding and Interfacing
If you are wanting more than one dedicated circuit spec all circuits to be fed from the same Line, leg, in the electrical panel. All from Line 1 or all from Line 2, but not from both.
Jim